SMpro VSAT mod?

[Tim]

Can anyone tell me if a VSAT can be added to the Surfpro?
I realise the SMpro and HH are different animals, but would it be achieved by replacing R21 with a pot??
Also any suggestions for simple changes for delay/width/sample, like a pot for an R,(or delay pot change) with small gold and a fast coil the goal? This may have been covered, but I'm still searching.
It is pretty bloody good as is, but all input appreciated.
How about DD cofiguration? Inductances? Damping? Any starting point suggestions???
My Tacoma56 DD is great with the ML Commander 10x5DD, but I want to etch another board, not sabotage my good one. I could dismantle it to check, but from memory it is 680 or 390R damping on TX(?) and none on RX.

[Tim]

Perhaps R8 needs to be variable?...Anyone??

[Sean_Goddard]

That schematic is totally wrong. Carl has posted the REAL Whites one. Work from that and you might get a better idea of what is going on

[Tim]

Thanks Sean. I have several SMPro schematics from here, but never compared them. Perhaps the one I posted came with my Tacoma56 board....? I'll have a gawk now.

[kt315]

Can anyone tell me if a VSAT can be added to the Surfpro?

VSAT HAD been added to the circuit HUGE TIME AGO. thats name is 'TERRY' MOD'.

TWO MODS - Eric Foster's mod and Terry's mod (2 MODS). note that anywhere at wall if you are not able to remember -!

[Tim]

D'oh! I had this info already! Lots in my SMpro file. Just needed to have a womans look. In answer to my own question-
Looks like 100K R(?) to a 100K pot, to earth, after C15 on original schem, which is 1uf on original and 470nf on others.
Do you think this would work Sean?
I already have an excellent working SMProDD from Tacoma56, which looks like Apbergs(?)XX board. With a 10x5MLDD commander it's near as good as my GMT on my 1.7g flour gold sample(air test). But on Aussie goldfields it may be disappointing yet.
If the ALLPCB.com HHd1 boards I ordered are decent quality, my next order from them will be some XX's.

Just saw your reply KT thanks. I'll search "terry".

[kt315]

REUSED P4 DISC CONTROL

my name is Not terry!!! LOL!!!

[Tim]

Thanks KT-a higher resolution pic than I had.

[Sean_Goddard]

This thread is amusing. KT315 "my name is Not terry!!! LOL!!!"

LMAO

[Sean_Goddard]

I used the http://www.geotech1.com/forums/attac...0&d=1470742814 VSAT mod you posted, works very well. I also playes with the integrator values to optimise for my style of searching (fast).

One other nice mod was to make the SECOND pulse adjustable wrt the first and thus give a degree of ground balancing as one of the beaches I work in Wales is littered with bricks from an old brick works and PI's pick these bricks up, so does the ETrac and the Whites Spectrum. There is another issue in that BIG ships anchor just off shore and the radar plays havoc with any detector, annoying as some nice gold coins and rings have come off this beach but BOY do you have to work for them.

[Tim]

Great stuff Sean! Hopefully also relevant to our mineralisation here. I have been busy finishing my Cert II Horticulture, but hope to attack the electronics in earnest again very soon.
Perhaps at some stage you could post a schem of the combined mods. I, at least, would appreciate it.
Perusing your posts, you are a very active experimenter, not afraid to think outside the square.

[6666]

One other nice mod was to make the SECOND pulse adjustable wrt the first and thus give a degree of ground balancing

Do you mean the width of the pulse is variable ?

[Jose]

Or to separation between pulses, first and second, samples ?

[Tim]

One other nice mod was to make the SECOND pulse adjustable wrt the first .

wrt= with regard to. Yes I think Jose is right 6666.

[Sean_Goddard]

Most of the time my experitmants end up doing something completely different to how I intended them to work and I find new stuff out. That is how Dave Emery cracked the discriminating PI, he was messing around with something I told him about and was trying to get the same results. He had misinterpreted my instructions and made a major discovery instead (at least that is what I was told). Dammit I was SOooooo close. But that is invention 99% perspiration (and cussing) and 1% innovation. I have 100's of small circuits built on Vero (strip) board most of which dont do anything.

I guess the moral of the story is if you don't really have a clue what you are doing, anything that does something, even if it's not what you hoped, can be counted as some sort of success. The trick is to write down the results and maybee later you can come back to that experimant and use it in something else. The active damping was something I used to slug a relay flyback to reduce RFI, I then tohught "HOLD UP, What is I could use that on a PI"? Haven't done it yet, but will as soon as I have the time (unless someone else gets there first).

I'll post up the schematic as soon as I get on my home machine.